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下列码表含有全部 128 个 ASCII 十进制 (dec) 、八进制 (oct) 、十六进制 (hex) 及字符 (ch) 编码。 阅读全文
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1，使用开源库 BadgeView （*推荐） https://github.com/stefanjauker/BadgeView 比较轻巧，功能也够用。不用在布局写代码就可以给任意一个View添加一个通知角标，下面是基本步骤和示例，注意listview的 BagdeView要缓存一个，不要每个it 阅读全文
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Re-using Layouts with THIS LESSON TEACHES YOU TOCreate a Re-usable LayoutUse the TagUse the TagYOU SHOULD ALSO READLayout Resources Although Androi... 阅读全文
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1. 主Fragment 设置一个主Fragment，其它fragment得到它就可以了。 示例如下： 1 val ft = fragmentManager?.beginTransaction() 2 val maiFrgmt = MainFrgmt() 3 ft?.replace(R.id.mai 阅读全文
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onInterceptTouchEvent可在onTouchEvent()前拦截触摸事件， ViewConfiguration得到触摸的属性如速度，距离等， TouchDelegate控制view展开 Managing Touch Events in a ViewGroup Handling tou 阅读全文
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1.Use Touch to Perform Scaling As discussed in Detecting Common Gestures, GestureDetector helps you detect common gestures used by Android such as scr 阅读全文
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Dragging This lesson describes how to use touch gestures to drag, using onTouchEvent() to intercept touch events. 1.Drag an Object If you are targetin 阅读全文
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Handling Multi-Touch Gestures A multi-touch gesture is when multiple pointers (fingers) touch the screen at the same time. This lesson describes how t 阅读全文
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Animating a Scroll Gesture In Android, scrolling is typically achieved by using the ScrollView class. Any standard layout that might extend beyond the 阅读全文
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Tracking Movement This lesson describes how to track movement in touch events. A new onTouchEvent() is triggered with an ACTION_MOVE event whenever th 阅读全文
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简介 基本步骤： Detecting Common Gestures A "touch gesture" occurs when a user places one or more fingers on the touch screen, and your application interpret 阅读全文
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docs/training/gestures/index.html Using Touch Gestures This class describes how to write apps that allow users to interact with an app via touch gestu 阅读全文
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1.屏幕单位 名称 单位缩写 单位全拼 介绍 屏幕尺寸 '' 或 in inch 屏幕的大小，通常用屏幕对角线的长度表示.单位是寸 屏幕分辨率 px pixels 整个屏幕的像素数，一般用屏幕的像素宽度（水平像素数）乘以像素高度表示，形如1280x720， 反之分辨率为1280x720的屏幕，像素宽 阅读全文
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Supporting Different Languages It’s always a good practice to extract UI strings from your app code and keep them in an external file. Android makes ... 阅读全文
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Supporting Different Platform Versions While the latest versions of Android often provide great APIs for your app, you should continue to support old... 阅读全文